GHA: switch 12 Linux jobs to arm64

More cost-effective and seems as fast or faster than Intel.

In particular, valgrind seems to be almost 2x fast. So fast the job pair
could fit under 10 minutes if merged again (but would be the longest in
GHA/Linux.)

Installing packages is slightly slower. The package repo is Ubuntu's
which is slower than the Azure mirror used on Intel (unless Azure is
broken, which happened a lot last year).

To add to more jobs, the locally built deps also need to be migrated.

Also:
- add workaround for failing sshd server on Linux arm runners, caused by
  world-writable `HOME` directory.

Closes #20231

.github/workflows/appveyor-status.yml

@@ -16,7 +16,7 @@ permissions: {}
 jobs:
   split:
     name: 'split'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     if: ${{ github.event.sender.login == 'appveyor[bot]' }}
     permissions:
       statuses: write  # To update build statuses

.github/workflows/checkdocs.yml

@@ -118,7 +118,7 @@ jobs:
 
   badwords-synopsis:
     name: 'badwords, synopsis'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
@@ -132,7 +132,7 @@ jobs:
 
   man-examples:
     name: 'man-examples'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:

.github/workflows/checksrc.yml

@@ -34,7 +34,7 @@ permissions: {}
 jobs:
   checksrc:
     name: 'checksrc'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:

.github/workflows/checkurls.yml

@@ -25,7 +25,7 @@ jobs:
   linkcheck:
     if: ${{ github.repository_owner == 'curl' || github.event_name != 'schedule' }}
     name: 'linkcheck'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:

.github/workflows/linux.yml

@@ -172,24 +172,26 @@ jobs:
             configure: --with-openssl --enable-debug --disable-unity
 
           - name: 'openssl libssh2 sync-resolver valgrind 1'
+            image: ubuntu-24.04-arm
             install_packages: libidn2-dev libssh2-1-dev libnghttp2-dev libldap-dev valgrind
             tflags: '--min=920 1 to 950'
             generate: -DENABLE_DEBUG=ON -DENABLE_THREADED_RESOLVER=OFF
 
           - name: 'openssl libssh2 sync-resolver valgrind 2'
+            image: ubuntu-24.04-arm
             install_packages: libidn2-dev libssh2-1-dev libnghttp2-dev libldap-dev valgrind
             tflags: '--min=910 951 to 9999'
             generate: -DENABLE_DEBUG=ON -DENABLE_THREADED_RESOLVER=OFF
 
-          - name: 'openssl'
+          - name: 'openssl intel'
             install_packages: libssh-dev
             install_steps: pytest
             configure: CFLAGS=-std=gnu89 --with-openssl --with-libssh --enable-debug
 
           - name: 'openssl arm'
+            image: ubuntu-24.04-arm
             install_steps: pytest
             configure: CFLAGS=-std=gnu89 --with-openssl --enable-debug --disable-verbose
-            image: 'ubuntu-24.04-arm'
 
           - name: 'openssl -O3 libssh valgrind 1'
             install_packages: libssh-dev valgrind
@@ -209,15 +211,18 @@ jobs:
             configure: CC=clang --enable-static --disable-shared --with-openssl --with-gssapi --enable-debug --disable-docs --disable-manual --with-ldap=/home/runner/openldap-static --with-ldap-lib=ldap --with-lber-lib=lber
 
           - name: 'openssl clang krb5 LTO'
+            image: ubuntu-24.04-arm
             install_packages: libssh2-1-dev libkrb5-dev clang
             install_steps: skiprun pytest
             CC: clang
             generate: -DCURL_USE_OPENSSL=ON -DCURL_USE_GSSAPI=ON -DENABLE_DEBUG=ON -DCURL_LTO=ON
 
           - name: 'openssl !ipv6 !--libcurl !--digest-auth'
+            image: ubuntu-24.04-arm
             configure: --with-openssl --disable-ipv6 --enable-debug --disable-unity --disable-libcurl-option --disable-digest-auth
 
           - name: 'openssl https-only'
+            image: ubuntu-24.04-arm
             tflags: '--min=1150'
             configure: >-
               --with-openssl --enable-debug --disable-unity
@@ -250,6 +255,7 @@ jobs:
               --with-openssl --with-librtmp --with-libssh2 --with-libidn2 --enable-ares --enable-debug
 
           - name: '!ssl !http !smtp !imap'
+            image: ubuntu-24.04-arm
             tflags: '--min=475'
             configure: --without-ssl --enable-debug --disable-http --disable-smtp --disable-imap --disable-unity
 
@@ -347,6 +353,7 @@ jobs:
             tflags: '-n --test-event --min=1350'
 
           - name: 'duphandle'
+            image: ubuntu-24.04-arm
             install_packages: libssh-dev
             configure: --enable-debug --enable-static --disable-shared --disable-threaded-resolver --with-libssh --with-openssl
             tflags: '-n --test-duphandle'
@@ -409,6 +416,12 @@ jobs:
           if [ -n "${INSTALL_PACKAGES_BREW}" ]; then
             HOMEBREW_NO_AUTO_UPDATE=1 /home/linuxbrew/.linuxbrew/bin/brew install ${INSTALL_PACKAGES_BREW}
           fi
+          # Workaround for ubuntu-24.04-arm images having 0777 for /home/runner,
+          # which breaks the test sshd server used in pytest.
+          if [[ "$(uname -m)" = *'aarch64'* ]]; then
+            ls -l /home
+            chmod 0755 /home/runner
+          fi
 
       - name: 'install prereqs (i686)'
         if: ${{ contains(matrix.build.name, 'i686') }}